It will renew each month after that for £5.99 so once it's confirmed and paid go to your account - passes and click the Sky Sports Mobile button then click cancel if you like your pass will still work for the month. Now it will ask you why click the box that says "I can't afford it" it will then as you if you're sure, click yes, it will then offer you an additional 3 months at £2.99 a month which you can take up if you like and save a further £9. If you don't want this and just want the darts click - no cancel.

So you end up getting 4 months of Sky Sports for £9.97 or 1 month for £1